| Soil-Structure Interaction(SSI) is a difficult problem in bridge seismic engineering. Double-column bridge pier is one of the most popular forms used in Chinese Passenger Dedicated Railway Line, and the research of its seismic security is an essential subject.This paper was focused on double-column bridge pier, and introduced a method considering SSI based on capacity spectrum method. By discussing the influences of SSI including flexible foundation effects, kinematic effects and foundation damping effects to its seismic response, the purpose is to offer an instructive guideline for the reseach on SSI and engineering earthquake-resistant design.Thus, the main research involved in the dissertation includes the following parts:1. The basic theories of elastoplastic analysis for seismic response including nonlinear dynamic analysis and nonlinear static analysis were introduced briefly. Then, the research and modeling methods of SSI were introduced.2. Calculated the foundation flexibility coefficient using the method of "m" factor and the way from FEMA356 respectively; Corresponding to the four different site types of Chinses code, built the finite element models of the pier taking account of two situations of whether have trains or not; By selecting the actual earthquake motion records belonged to different site types, the time-history analysis were carried out to the models; Discussed the influence of foundation flexibility and site characteristic to the pier's seismic response.3. Introduced the improved equivalent linearization method and the capacity spectrum method which could consider all the aspects of the SSI in FEMA440; Brought these methods to the applications of bridge structures; Studied on the influences of foundation flexibility, kinematic effects and foundation damping effects to the seismic response and the differences of the analytical results between the nonlinear time-history analysis and the capacity spectrum method.
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